Nebula Operator 云上实践

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Nebula Operator

嗨,大家好!Nebula Operator 开源也有一段时间了,之前也有一篇相关的博客介绍,但是实践相关的博客却还没有,现在:

它来了!来了!它带着实践走来了!

Nebula Operator 介绍

关于 Nebula Operator 的介绍,大家可以参考之前那篇博客:一文详解云上自动化部署集群管理工具 Nebula Operator

本文将主要侧重于实践方向,让你能很快地入手 Nebula Operator,体验图数据库的乐趣!

Nebula Operator云上实践

到这里,开始进入正题,本文将使用阿里云进行 Nebula Operator 实践,其他云厂商类似。

安装工具

本次实践需要在操作电脑上安装如下基础工具:

以上基础工具相关的安装方法请参考对应链接。

创建云上 Kubernetes

因为 Operator 是依托于 Kubernetes 的,所以在进行 Nebula Operator 实践之前,需要先准备好 Kubernetes 环境。

首先进入到阿里云的控制台,然后进入到容器服务 Kubernetes 版,再创建一个集群。此实践选择的是 ACK 托管版,相关的创建参数请按需选择。

注意: 为了方便外网访问 Kubernetes API Server ,本次实践勾选了使用 EIP 暴露 API Server,你可以根据自身情况选择是否启用,如果不开启,你需要打通操作电脑与 Kubernetes 的之间网络。其他参数请按需选择

等待 Kubernetes 集群启动后,将集群的连接信息公网访问中的内容复制到计算机$HOME/.kube/config文件中。

然后你可以使用如下命令验证下 Kubernetes 集群:

$ kubectl get nodes
NAME                         STATUS   ROLES    AGE   VERSION
cn-beijing.192.168.250.13    Ready    <none>   51m   v1.20.4-aliyun.1
cn-beijing.192.168.250.185   Ready    <none>   51m   v1.20.4-aliyun.1
cn-beijing.192.168.250.89    Ready    <none>   51m   v1.20.4-aliyun.1

安装 Nebula Operator 依赖

在安装 Nebula Operator 之前,还需要先安装一些依赖。

安装 CertManager

# 安装 CertManager
$ helm install cert-manager cert-manager --repo https://charts.jetstack.io \
    --namespace cert-manager --create-namespace --version v1.3.1 \
    --set installCRDs=true
# 稍等一会儿,检测 CertManager 是否启动正常
$ kubectl -n cert-manager get pod
NAME                                       READY   STATUS    RESTARTS   AGE
cert-manager-7998c69865-jfw9x              1/1     Running   0          93s
cert-manager-cainjector-7b744d56fb-846w9   1/1     Running   0          93s
cert-manager-webhook-7d6d4c78bc-ssk4w      1/1     Running   0          93s

安装 OpenKruise

# 安装 OpenKruise
$ helm install kruise \
    https://github.com/openkruise/kruise/releases/download/v0.8.1/kruise-chart.tgz
# 稍等一会儿,检测 OpenKruise 是否启动正常
$ kubectl -n kruise-system get pod
NAME                                         READY   STATUS    RESTARTS   AGE
kruise-controller-manager-6797f89d9b-ppv65   1/1     Running   0          49s
kruise-controller-manager-6797f89d9b-wlkbd   1/1     Running   0          49s
kruise-daemon-7rljq                          1/1     Running   0          49s
kruise-daemon-8kd8d                          1/1     Running   0          49s
kruise-daemon-n6tdw                          1/1     Running   0          49s

添加 Nebula Operator Charts

# 添加 Nebula Operator Charts Repo
$ helm repo add nebula-operator https://vesoft-inc.github.io/nebula-operator/charts
# 更新 repo
$ helm repo update

安装 Nebula Operator

由于阿里云上无法拉取gcr.iok8s.gcr.io镜像,因此需要指定国内镜像,这里进行了如下替换:

原镜像替换后镜像
gcr.io/kubebuilder/kube-rbac-proxy:v0.8.0kubesphere/kube-rbac-proxy:v0.8.0
k8s.gcr.io/kube-scheduler:v1.18.8kubesphere/kube-scheduler:v1.18.8

你可以通过如下命令查看所有可以设置的参数:

$ helm show values nebula-operator/nebula-operator

此次实践中的安装命令如下:

# 安装 Nebula Operator
$ helm install nebula-operator nebula-operator/nebula-operator \
    --namespace nebula-operator-system --create-namespace --version 0.1.0 \
    --set image.kubeRBACProxy.image=kubesphere/kube-rbac-proxy:v0.8.0 \
    --set image.kubeScheduler.image=kubesphere/kube-scheduler:v1.18.8
# 稍等一会儿,检测 Nebula Operator 是否启动正常
$ kubectl -n nebula-operator-system get pod
NAME                                                             READY   STATUS    RESTARTS   AGE
nebula-operator-controller-manager-deployment-6968547fff-k62b4   2/2     Running   0          19s
nebula-operator-controller-manager-deployment-6968547fff-lhpdx   2/2     Running   0          19s
nebula-operator-scheduler-deployment-7c5fc7945-hbkv8             2/2     Running   0          19s
nebula-operator-scheduler-deployment-7c5fc7945-sxc7w             2/2     Running   0          19s

如果你自定义了 Kubernetes 的 Cluster Domain ,则需要修改安装命令,增加设置kubernetesClusterDomain,如下:

# 安装 Nebula Operator ,请修改 <<YourCustomCLusterDomain>>
$ helm install nebula-operator nebula-operator/nebula-operator \
    --namespace nebula-operator-system --create-namespace --version 0.1.0 \
    --set image.kubeRBACProxy.image=kubesphere/kube-rbac-proxy:v0.8.0 \
    --set image.kubeScheduler.image=kubesphere/kube-scheduler:v1.18.8 \
    --set kubernetesClusterDomain=<<YourCustomCLusterDomain>>

部署 Nebula Cluster

至此,Nebula Operator 已经就绪,接下来安装Nebula Cluster来体验图数据吧!

首先,需要获取StorageClass,这个将会用来设置Nebula Cluster所使用的存储。

$ kubectl get sc
NAME                       PROVISIONER                       RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
alicloud-disk-available    diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-efficiency   diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-essd         diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-ssd          diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-topology     diskplugin.csi.alibabacloud.com   Delete          WaitForFirstConsumer   true                   100m

从上面得知,阿里云目前支持5StorageClass。此次实践将会使用alicloud-disk-ssd。其他云厂商会有对应的StorageClass,请按照实际情况进行选择。
*注意:每个云厂商可能对于申请存储的大小有范围限制,比如阿里云对于 SSD 限制在20 Gi32,768 Gi,在创建Nebula Cluster的时候需要注意下。

你可以通过如下命令查看所有可以设置的参数:

$ helm show values nebula-operator/nebula-cluster

此次实践中的安装命令如下:

# 创建 Nebula Cluster 的名称
$ export NEBULA_CLUSTER_NAME=nebula
# 创建 Nebula Cluster 的 namespace
$ export NEBULA_CLUSTER_NAMESPACE=nebula
# 创建 Nebula Cluster 的 StorageClass 名称,这里设置为之前查找到的 alicloud-disk-ssd
$ export STORAGE_CLASS_NAME=alicloud-disk-ssd
# 创建 Nebula Cluster 中每个组建所使用存储的大小
$ export STORAGE_SIZE_GRAPHD=20Gi
$ export STORAGE_SIZE_METAD=20Gi
$ export STORAGE_SIZE_STORAGED=20Gi
# 创建 Nebula Cluster
$ helm install ${NEBULA_CLUSTER_NAME} nebula-operator/nebula-cluster \
    --namespace ${NEBULA_CLUSTER_NAMESPACE} --create-namespace --version 0.1.0 \
    --set nameOverride=${NEBULA_CLUSTER_NAME} \
    --set nebula.storageClassName="${STORAGE_CLASS_NAME}" \
    --set nebula.graphd.storage="${STORAGE_SIZE_GRAPHD}" \
    --set nebula.metad.storage="${STORAGE_SIZE_METAD}" \
    --set nebula.storaged.storage="${STORAGE_SIZE_STORAGED}"
# 稍等一会儿,检测 Nebula Cluster 是否启动正常
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get nebulacluster
NAME     GRAPHD-DESIRED   GRAPHD-READY   METAD-DESIRED   METAD-READY   STORAGED-DESIRED   STORAGED-READY   AGE
nebula   2                2              3               3             3                  3                4m10s
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get pod
NAME                READY   STATUS    RESTARTS   AGE
nebula-graphd-0     1/1     Running   0          96s
nebula-graphd-1     1/1     Running   0          96s
nebula-metad-0      1/1     Running   0          97s
nebula-metad-1      1/1     Running   0          97s
nebula-metad-2      1/1     Running   0          97s
nebula-storaged-0   1/1     Running   0          97s
nebula-storaged-1   1/1     Running   0          97s
nebula-storaged-2   1/1     Running   0          97s

当然,也可以将Storaged实例升级到5个,执行命令如下:

# 升级 Nebula Cluster
$ helm upgrade ${NEBULA_CLUSTER_NAME} nebula-operator/nebula-cluster \
    --namespace ${NEBULA_CLUSTER_NAMESPACE} --create-namespace --version 0.1.0 \
    --set nameOverride=${NEBULA_CLUSTER_NAME} \
    --set nebula.storageClassName="${STORAGE_CLASS_NAME}" \
    --set nebula.graphd.storage="${STORAGE_SIZE_GRAPHD}" \
    --set nebula.metad.storage="${STORAGE_SIZE_METAD}" \
    --set nebula.storaged.storage="${STORAGE_SIZE_STORAGED}" \
    --set nebula.storaged.replicas=5
# 稍等一会儿,检测 Nebula Cluster 是否启动正常
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get nebulacluster
NAME     GRAPHD-DESIRED   GRAPHD-READY   METAD-DESIRED   METAD-READY   STORAGED-DESIRED   STORAGED-READY   AGE
nebula   2                2              3               3             5                  5                6m12s
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get pod
NAME                READY   STATUS    RESTARTS   AGE
nebula-graphd-0     1/1     Running   0          2m30s
nebula-graphd-1     1/1     Running   0          2m30s
nebula-metad-0      1/1     Running   0          2m30s
nebula-metad-1      1/1     Running   0          2m30s
nebula-metad-2      1/1     Running   0          2m30s
nebula-storaged-0   1/1     Running   0          2m30s
nebula-storaged-1   1/1     Running   0          2m30s
nebula-storaged-2   1/1     Running   0          2m30s
nebula-storaged-3   1/1     Running   0          52s
nebula-storaged-4   1/1     Running   0          52s

详细的安装说明请见:使用 Helm 安装 Nebula Operator

访问 Nebula Cluster

终于,Nebula Cluster 启动成功了,接下来开始访问集群吧!

Kubernetes 内部访问

首先,在 Kubernetes 中启动一个 Nebula Graph Console,执行命令如下:

$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: nebula-console
spec:
  containers:
    - name: nebula-console
      image: vesoft/nebula-console:v2-nightly
      command:
      - sleep
      - "1000000"
EOF

然后再通过刚才创建的 Nebula Graph Console 来访问集群,如下:

$ kubectl exec -it nebula-console -- \
    nebula-console -u u -p p --addr ${NEBULA_CLUSTER_NAME}-graphd-svc.${NEBULA_CLUSTER_NAMESPACE}.svc --port 9669
2021/06/23 06:21:22 [INFO] connection pool is initialized successfully
Welcome to Nebula Graph!
(u@nebula) [(none)]> show hosts
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| Host                                                                  | Port | Status   | Leader count | Leader distribution  | Partition distribution |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-0.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-1.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-2.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-3.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-4.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "Total"                                                               |      |          | 0            |                      |                        |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
Got 4 rows (time spent 7669/9367 us)
Wed, 23 Jun 2021 06:21:26 UTC

Kubernetes 外部访问

Kubernetes 内部的服务在集群外部要想访问,可以使用hostPorthostNetworkIngressLoadBalancer等。这里利用云厂商的便利性,直接使用LoadBalancer来访问集群。

注意:此方法会暴露你的 Nebula 集群,请勿在生产环境使用。

首先,将Graphd Servicetype改成LoadBalancer,然后再查看EXTERNAL-IP

# 将 service 的 type 改成 LoadBalancer
$ kubectl patch -n ${NEBULA_CLUSTER_NAMESPACE} svc ${NEBULA_CLUSTER_NAME}-graphd-svc \
    -p '{"spec": {"type": "LoadBalancer"}}'
# 获取 EXTERNAL-IP ,如果为 pending ,请稍等一会儿再重试
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get svc nebula-graphd-svc
NAME                TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)                                          AGE
nebula-graphd-svc   LoadBalancer   172.16.85.222   x.x.x.x         9669:31460/TCP,19669:32579/TCP,19670:31481/TCP   27m

现在,可以根据EXTERNAL-IP来访问集群了,比如此处为x.x.x.x

$ export EXTERNAL_IP=x.x.x.x
$ docker run -it --rm vesoft/nebula-console:v2-nightly -u u -p p --addr ${EXTERNAL_IP} --port 9669
2021/06/23 06:42:17 [INFO] connection pool is initialized successfully
Welcome to Nebula Graph!
(u@nebula) [(none)]> show hosts
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| Host                                                                  | Port | Status   | Leader count | Leader distribution  | Partition distribution |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-0.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-1.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-2.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-3.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-4.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "Total"                                                               |      |          | 0            |                      |                        |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
Got 4 rows (time spent 3747/60433 us)
Wed, 23 Jun 2021 06:42:21 UTC

享用时间

大功告成!

尽情地在 Nebula Graph 中驰骋吧!

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